doc: remove Sam Roberts from release team

Also, remove my key, since I never did a release.

PR-URL: https://github.com/nodejs/node/pull/9862
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Johan Bergström <bugs@bergstroem.nu>

README.md

@@ -358,15 +358,12 @@ Releases of Node.js and io.js will be signed with one of the following GPG keys:
 `C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8`
 * **Rod Vagg** <rod@vagg.org>
 `DD8F2338BAE7501E3DD5AC78C273792F7D83545D`
-* **Sam Roberts** <octetcloud@keybase.io>
-`0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93`
 
 The full set of trusted release keys can be imported by running:
 
 ```shell
 gpg --keyserver pool.sks-keyservers.net --recv-keys 9554F04D7259F04124DE6B476D5A82AC7E37093B
 gpg --keyserver pool.sks-keyservers.net --recv-keys 94AE36675C464D64BAFA68DD7434390BDBE9B9C5
-gpg --keyserver pool.sks-keyservers.net --recv-keys 0034A06D9D9B0064CE8ADF6BF1747F4AD2306D93
 gpg --keyserver pool.sks-keyservers.net --recv-keys FD3A5288F042B6850C66B31F09FE44734EB7990E
 gpg --keyserver pool.sks-keyservers.net --recv-keys 71DCFD284A79C3B38668286BC97EC7A07EDE3FC1
 gpg --keyserver pool.sks-keyservers.net --recv-keys DD8F2338BAE7501E3DD5AC78C273792F7D83545D